std::printf is an STL function to write formatted output to std::cout.

std::printf is not typesafe (see example below). For a type-safe alternative, use boost::format instead.


#include <cstdio>

#include <iostream>

#include <boost/format.hpp>



int main()

{

  //Correct

  std::printf("(x,y) = (%1+5d,%2+5d) \n",-1,2);

  std::cout

    << boost::format("(x,y) = (%1+5d,%2+5d) \n") % -1 % 2;



  //Incorrect

  std::printf("(x,y) = (%1+5d,%2+5d) \n",-1.5,2.5);

  std::cout

    << boost::format("(x,y) = (%1+5d,%2+5d) \n") % -1.5 % 2.5;

}

Screen output:


(x,y) = (   -1, +2)

(x,y) = (   -1, +2)

(x,y) = (   +0,-1074266112)

(x,y) = ( -1.5, +2.5)

External links

Cplusplus.com page about std::printf

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++) std::printf

External links